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问题描述

从我开始使用Groovy已经过去了几天。但是随着所有的阅读和冲浪,我还没有完全弄清楚如何实现我的想法。所以,请原谅我作为初学者。感谢您的帮助,一如既往。



我想实现的是:我有一个Java类,比如<$ (code> getMethod(), postMethod()的c $ c> ServiceClass 等等)做出一些REST GET / POST请求(在它自己的情况下,它工作正常)。现在,我想公开一个DSL,以便最终用户可以这样说: callService ServiceClass方法getMethod 并且执行 ServiceClass .getMethod()



我一直在尝试的是:我得到了一个 userCommand 文件放在某处,现在只读: callService ServiceClass



我有一个<$ c $

  class示例{
def sample.groovy srvc
def callService(srvc){
this.srvc = srvc
调用$ srvc
}
}

我得到了一个 integrator.groovy 文件:

  //必要的输入
class Integrator {
def sample = new Sample()
def binding = new Binding([
sample:sample,
ServiceClass:new ServiceClass(),
callService:sample。& callService])
def sh ell = new GroovyShell(binding)

def runIt(){
shell.evaluate(userCommand)
}
}

然后从我的Java应用程序运行它,我这样做:

 Integator i = new Integrator()
i.runIt();
}

但这不起作用。使用上面的语法说:

任何人都可以告诉我如何传递参数并创建对象实例?

解决方案

更新:考虑以下 userCommand 文件:


$ b

文件 userCommand :

  callService ServiceClass getMethod 

groovy将解析为 callService(ServiceClass) .getGetMethod()。因此,您需要一个 getProperty 方法,将调用重定向到正确的方法:

文件 Dsl.groovy :

  class Dsl {
static void main(args){
新的Integrator()。runIt()
}
}

class DslDelegate {
def service
def callService(service){
this.service = service
this
}
$ b $ def getProperty(String prop){
if(prop ==getMethod){service.getMethod( )}
else {throw new RuntimeException(Unrecognized property'$ prop')}
}
}

class ServiceClass {
def getMethod( ){serviceClass getMethod}
}
$ b $ class Integrator {
def dslDelegate = new DslDelegate()
def binding = new Binding([
ServiceClass :new ServiceClass(),
callService:dslDelegate。& callService])
def shell = new GroovyShell(binding)

def run It(){
assert shell.evaluate(new File(userCommand))==
serviceClass getMethod
}
}
类,所以它变成了一个委托给<$ c $>的类。

C>服务类。现在它分离了DSL /服务的职责。



您也可以执行 callService ServiceClass方法getMethod ,但它需要更多的代码。


It has been a couple of days since I started with Groovy. But with all the reading and surfing, I haven't quite been able to figure out how to accomplish what I have in mind. So, please excuse me as a beginner. Would be much grateful for your help, as always.

What I want to achieve is this: I have a Java class, say ServiceClass that has some methods (getMethod(), postMethod() etc) to make some REST GET/POST requests (on its own, it works fine). Now, I want to expose a DSL so that the end-user may just say something like: callService ServiceClass method getMethod and I have the execution of ServiceClass.getMethod()

What I have been trying so far is this: I got a userCommand file placed somewhere, that for now just reads: callService ServiceClass

I have a sample.groovy that just does this now:

class Sample {
    def srvc
    def callService(srvc) {
        this.srvc = srvc
        "Calling $srvc"
    }
}

I got an integrator.groovy file that has:

//necessary imports
class Integrator{
    def sample = new Sample()
    def binding = new Binding([
        sample:sample,
        ServiceClass: new ServiceClass(),
        callService:sample.&callService ])
    def shell = new GroovyShell(binding)

    def runIt() {
        shell.evaluate("userCommand")
    }
}

And then to run it from my Java application, I am doing:

public static void main(String[] args) {
    Integator i = new Integrator()
    i.runIt();
}

But this is just not working. With the above syntax it says:

Could anyone please tell me how do I pass around parameters and create object instances?

解决方案

Update: Consider the following userCommand file:

File userCommand:

callService ServiceClass getMethod

Which will be parsed by groovy as callService(ServiceClass).getGetMethod(). So you need a getProperty method which reroute the call to the correct method:

File Dsl.groovy:

class Dsl {
  static void main(args) {
      new Integrator().runIt()
  }
}

class DslDelegate {
    def service
    def callService(service) {
        this.service = service
        this
    }

    def getProperty(String prop) {
      if (prop == "getMethod") { service.getMethod() }
      else { throw new RuntimeException("Unrecognized property '$prop'") }
    }
}

class ServiceClass {
  def getMethod() { "serviceClass getMethod" }
}

class Integrator{
    def dslDelegate = new DslDelegate()
    def binding = new Binding([
        ServiceClass: new ServiceClass(),
        callService:dslDelegate.&callService ])
    def shell = new GroovyShell(binding)

    def runIt() {
        assert shell.evaluate(new File("userCommand")) ==
            "serviceClass getMethod"
    }
}

Note I renamed the Sample class, so it becomes a delegator to ServiceClass. Now it separates DSL/Service responsibilities.

You can do callService ServiceClass method getMethod too, but it requires more code.

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06-29 00:07